Knife key holder



FIG. 1 is a front elevation of a knife key holder showing my new design;

FIG. 2 is a right side elevation thereof;

FIG. 3 is a back elevation thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevation thereof.

The broken line showing of key rings is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a knife key holder, as shown and described. 